Regeneration characteristics and kinetics of Ni / ZnO – SiO2 – A l2O3 adsorbent for reactive adsorption desulfurization / Yaoshun Wen in Industrial & engineering chemistry research, Vol. 51 N° 10 (Mars 2012)  

Regeneration characteristics and kinetics of Ni / ZnO – SiO2 – A l2O3 adsorbent for reactive adsorption desulfurization [texte imprimé] / Yaoshun Wen, Auteur ; Gang Wang, Auteur ; Qian Wang, Auteur . - 2012 . - pp. 3939–3950.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3939–3950

Mots-clés :	Kinetics Adsorbent Desulfurization
Résumé :	Regeneration experiments on Ni/ZnO–SiO2–Al2O3 adsorbents for gasoline reactive adsorption desulfurization (RADS) were carried out in a fixed-bed microreactor at atmosphere pressure. X-ray diffraction, scanning electron microscopy/energy-dispersive spectroscopy, X-ray photoelectron spectrometry, and N2 isotherms were used to identify changes in the physical and chemical properties of the adsorbent before and after regeneration. The results showed that high O2 concentrations significantly increase the regeneration rate of the adsorbent but yield zinc sulfate. A regeneration condition that decreases the formation of zinc sulfate, including low O2 concentration with high temperature, was then investigated. Finally, a shrinking core model (SCM) was applied to account for the regeneration kinetics of the Ni/ZnO–SiO2–Al2O3 adsorbent, and the relevant kinetic parameters were determined. The regeneration is controlled first by a chemical reaction and then by layer diffusion. The desulfurization activity of the regenerated adsorbent over three desulfurization and regeneration cycles is almost identical to that of fresh adsorbent.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie202730w